Question

Identify me.
1)I slow down speed of oxygen.
2)Mountains, highlands,plains etc are part of me.
3)I extend about 1600km from the surface of the earth.
4)I am the member of solar family who has biosphere.​

Answer 1

Answer:

I think it's air

sorry if I am wrong

Answer 2

Answer:

1) nitrogen

2) landforms

3) atmosphere

4) earth